My question wouldn't be, can you fit the bigger screen? It is why would you want to?
We have a pre and post facelift and neither my wife or I like the bigger screen. It's not that we dislike the screen itself, that's not an issue, but the removal of the direct access buttons is pain. You don't realize how good it is being able to go straight from the radio to the sat-nav and back again at the touch of one button until you cannot do it any more.
The bigger screen looks cool, which is why they did it obviously, but functionally it's worse. If you want to get a feeling of what it will be like, just tape over your direct access buttons for a week and only use the carousel menu to get around. Yeah, pretty annoying.